Web Forms :: New Entries Added To Listbox Not Appearing After Postback?

Oct 22, 2010

I have added a listbox, and on page load I populate it with a few items. Then I have added Javascript code so that the client can click a button to add more items to the listbox. But when the page is postedback I am only left with the items that were loaded from the page load....

Is this the way .net operates?

I was reading that if I need to get all the items in the listbox, I will need to add a hidden field and write out the items in a CSV format, and then use that hidden field to work out the items in the listbox..

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da1 = new SqlDataAdapter("SELECT COURSE_ID,COURSE_NAME FROM Course_Mst", con);
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protected void LB1_SelectedIndexChanged(object sender, EventArgs e)
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I am having a ADD button.In LB2 I can select multiple items.When I select multiple items in LB2 and click on ADD all the selected items will be binded into LB3.The code is shown below...

protected void btnAddCourseDetaisl_Click(object sender, EventArgs e)
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My problem is when I select a item from LB2 and click on ADD the selecteditem is added to LB3 but if I select the same item and click on ADD the items are again added to the LB3.I want to prevent this.Pls respond me ASAP.

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Web Forms :: Store Selected Index Of Listbox In Hidden Field And Then Return To That Value On Postback?

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[Code]....

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Here are some of the codes which are relevant to it.

[code]....

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[Code]....

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followed by updating array list.

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&#65279;The script below is what i have done so far.

Partial Class _Default
Inherits System.Web.UI.Page
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=======================================
Sub UpdateSwap(ByVal valueA As String, ByVal ValueBAs String, ByVal ValueC As Integer, ByVal ValueD As Date)

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[Code]....

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